Make inference about population parameters HSS.IC.A.1 Grade 10 ACTASPIRE Practice Test Questions TOC | Lumos Learning

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Suppose the ideal number of railroad cars on a freight train is 82. A random sample of the lengths of freight trains was taken and the number of cars was counted on each train. The number of cars in the sample was normally distributed. The mean of the sample was 82 with a standard deviation of 6. What percent of the freight trains in the sample had more than the ideal number of railroad cars? Round your answer to the nearest whole number. Do not enter the percent sign.

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Question Type: Numeric Answer

Standard(s):HSS.ID.A.4

Standard Description: Use the mean and standard deviation of a data set to fit it to a normal distribution and to estimate population percentages. Recognize that there are data sets for which such a procedure is not appropriate. Use calculators, spreadsheets, and tables to estimate areas under the normal curve.

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